Home > Uncategorized > Human Anatomy Lecture 5: Large Intestine

Human Anatomy Lecture 5: Large Intestine

Today’s lecture costs 54 minutes. This one will conclude our series on

the digestive system.

The lamina propria has both blood capillaries and lymph vessels. Non fats

tend to be water soluble. They are taken by the hepatic portal vein to

the liver, where nutriets are processed and stored. Lipids are paired

with albumin and go into general circulation then back into the liver.

Disorders of the SI include enteritis, duodenal ulcers (caused by


Stomach and intestine doctors are gastroentrologists.

The larger intestine has a larger bore than the SI. It is 4 feet long.

The appendix guards its entrace for bacteria.

Cecum, ascending, transverse, descending, sigmoid, rectum, anus. This is

the order from beginning to end.

The first bend is the hepatic flexure or the right colic. Then the second

bend is the splenic flexure or left colic.

The LI has sacculations called hosstra. It stores water and bacterial

digestion of remaining chyme in food residue. Cellulose or fiber,

Lower GI series is done by enema and by drinking some barium, then x

raying. UTIs in women are caused by E Coli.

The appendix is a 3.5 inch tonsil off the abdomen. Appendicitis leads to

appendectomy. This usually occurs in early to late teens.

There is an internal involuntary sphincter (visceral smooth muscle) and an

outer, voluntary one (skeletal muscle).

Diarrhea and constipation are opposites. One is increases peristaltic

contractions leading to loose watery stool. The other is reduced

peristaltic contraction leading to hard dry stool.

Prunes are dry plums, apricots are dried peaches.

Diverticulitis are bulging weak spots in the intestine. This is caused by

a lack of fiber. Even smooth muscle needs to be challenged, like skeletal


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